package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;

@Slf4j
//@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //转为 http
        HttpServletRequest  request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1. 获取请求路径
        String uri = request.getRequestURI();

        //2. 判断请求路径是否为登录请求，如果是，放行
        if (uri.contains("/login")){//登录请求
            log.info("登录请求{},放行", uri);
            filterChain.doFilter(request, response);
            return;
        }

        //3.获取请求头中的token
        String jwt = request.getHeader("token");

        //4.判断token是否存在，如果不存在，响应401状态码
        if (jwt == null|| jwt.isBlank()){
            log.info("请求头中没有token");
            response.setStatus(401);
            return;
        }

        //5.解析令牌，如果解析失败，响应401状态码
        try{
            Claims claims = JwtUtils.parseToken(jwt);
            Integer userId = claims.get("id", Integer.class);
            log.info("当前用户为id:{}，存入ThreadLocal中", userId);
            CurrentUserHoler.setCurrentUser(userId);

        } catch (Exception e) {
            log.info("令牌解析失败，{}",e.getMessage());
            response.setStatus(401);
            return;
        }

        //6.放行
        log.info("拦截器放行");
        filterChain.doFilter(request, response);

        //7.释放资源
        log.info("删除ThreadLocal中的登录用户信息");
        CurrentUserHoler.removeCurrentUser();

    }
}
